javascript 使用 Jquery 检查大写/小写/数字
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Checking for uppercase/lowercase/numbers with Jquery
提问by user1725794
Either I'm being really retarded here or its just the lack of sleep but why doesn't this work? If I use the "or" operator it works for each separate test but as soon as it change it to the "and" operator it stops working.
要么我在这里真的很迟钝，要么只是缺乏睡眠，但为什么这不起作用？如果我使用“或”运算符，它适用于每个单独的测试，但一旦将其更改为“和”运算符，它就会停止工作。
I'm trying to test the password input of a form to see if its contains lowercase, uppercase and at least 1 number of symbol. I'm having a lot of trouble with this so help would be lovely, here is the code I have.
我正在尝试测试表单的密码输入，以查看其是否包含小写、大写和至少 1 个符号。我在这方面遇到了很多麻烦，所以帮助会很可爱，这是我的代码。
var upperCase= new RegExp('[^A-Z]');
var lowerCase= new RegExp('[^a-z]');
var numbers = new RegExp('[^0-9]');
if(!$(this).val().match(upperCase) && !$(this).val().match(lowerCase) && !$(this).val().match(numbers))
{
$("#passwordErrorMsg").html("Your password must be between 6 and 20 characters. It must contain a mixture of upper and lower case letters, and at least one number or symbol.");
}
else
{
$("#passwordErrorMsg").html("OK")
}
回答by cdn
All of your regular expressions are searching for anything exceptthe ranges that you have provided. So, [^A-Z] looks for anything but A-Z.
您所有的正则表达式都在搜索除您提供的范围之外的任何内容。因此，[^AZ] 查找除 AZ 之外的任何内容。
You are also negating each match.
你也在否定每场比赛。
You might try modifying your regular expression definitions by removing the ^, and then reversing your logic. So,
您可以尝试通过删除 ^ 来修改正则表达式定义，然后反转逻辑。所以，
var upperCase= new RegExp('[A-Z]');
var lowerCase= new RegExp('[a-z]');
var numbers = new RegExp('[0-9]');
if($(this).val().match(upperCase) && $(this).val().match(lowerCase) && $(this).val().match(numbers))
{
$("#passwordErrorMsg").html("OK")
}
else
{
$("#passwordErrorMsg").html("Your password must be between 6 and 20 characters. It must contain a mixture of upper and lower case letters, and at least one number or symbol.");
}
This might even be a bit more intuitive to read?
这甚至可能更直观一些？
回答by George SEDRA
var upperCase= new RegExp('[A-Z]');
var lowerCase= new RegExp('[a-z]');
var numbers = new RegExp('[0-9]');
if($(this).val().match(upperCase) && $(this).val().match(lowerCase) && $(this).val().match(numbers) && $(this).val().lenght>=6 && $(this).val()<=20)
{
$("#passwordErrorMsg").html("OK")
}
else
{
$("#passwordErrorMsg").html("Your password must be between 6 and 20 characters. It must contain a mixture of upper and lower case letters, and at least one number or symbol.");
}
